Hurricane Michael (Details) $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($) T	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Loss on disposal of assets		$ 5,223	$ 887	$ 9
Insurance proceeds		7,199
Proceeds from settlement received			$ 3,500
Hurricane Michael
Loss Contingencies [Line Items]
Loss on disposal of assets		7,300
Insurance proceeds		7,200
Insurance settlements receivable		$ 6,700
Estimated loss as a percent of total timber assets		3.00%
Estimated quantity of timber lost or to be salvaged (in tons) | T		234,000
Timber loss expense		$ 300
Additional hurricane expense excluding timber loss		1,000
Insurance recovery for additional hurricane expense		0
Proceeds from business interruption insurance		$ 0
Proceeds from settlement received	$ 6,100